Question

I'm completely lost. Can anyone help?

Answer 1

Answer:

1 mole

Explanation:

The balanced equation for is given below:

2Na + 2H2O —>2NaOH + H2

Next, we shall determine the number of mole of NaOH in 40g of NaOH.

This is illustrated below:

Mass of NaOH = 40g

Molar Mass of NaOH = 23 + 16 + 1 = 40g/mol

Number of mole =Mass /Molar Mass

Number of mole NaOH = 40/40 = 1 mole

Finally, we shall determine the number of mole of Na required to produce 1 mole of NaOH ( i.e 40g).

This is illustrated below:

From the balanced equation above,

2 moles of Na reacted to produce 2 moles of NaOH.

Therefore, it will take 1 mole of Na to also produce 1 mole of NaOH.